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Typical misinformation as common on this board.
Run flat tires have stiffer sidewalls that are able to support the weight of the car without being properly inflated. You can generally drive for about 50 miles or so when deflated.
In practical terms this means that you can safely drive to a tire shop if you happen to run over a nail and don't have to worry about changing your tire on the side of the road, in the rain and at night.
That said, the stiffer sidewall gives a harsher ride and the tires are not always immune to catastrophic failure following a run-in with a major pothole.
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